381669 has 16 divisors (see below), whose sum is σ = 544320. Its totient is φ = 237440.

The previous prime is 381659. The next prime is 381673. The reversal of 381669 is 966183.

It is a cyclic number.

It is not a de Polignac number, because 381669 - 2⁵ = 381637 is a prime.

It is a super-2 number, since 2×381669² = 291342451122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 381669.

It is not an unprimeable number, because it can be changed into a prime (381629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3514 + ... + 3620.

It is an arithmetic number, because the mean of its divisors is an integer number (34020).

2³⁸¹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

381669 is a deficient number, since it is larger than the sum of its proper divisors (162651).

381669 is a wasteful number, since it uses less digits than its factorization.

381669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180.

The product of its digits is 7776, while the sum is 33.

The square root of 381669 is about 617.7936548719. The cubic root of 381669 is about 72.5374519142.

The spelling of 381669 in words is "three hundred eighty-one thousand, six hundred sixty-nine".